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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Brake system leverage calculations for foot and hand brakes, using 40° cams and non-wrapping shoes.

Identifier  ExFiles\Box 120\2\  scan0335
Date  10th June 1938
  
-6-
10.6.38.
cams
Using 40°, and non wrapping shoes.
Diagram values: 13.925, 4.5, 1.35, 1.725, 1.85, 1.75, 6.5, 4.875, 1.8, 1.8, 2:1, 6.32.
Calculation: (13.925 x 1.35 x 1.85 x S x 4.875 x 1.8 x 1 x 2 x 6.32) / (4.5 1.725 1.75 6.5 1.8 1) = 24.2 S
40° Cams = 2.45
= 59.2 : 1
Hand Brake.
Calculation: (17 x 1.8 x 1 x 2 x 6.32) / (2.850 1.8) = 75.4 : 1
Diagram values: 17, 2.85, 1.8, 1.8, 2:1, 6.32:1.
Ratio Front to Rear 59.2 / 59.2 = 1 : 1
Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}
  
  


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